All-fiber zero-insertion-loss add–drop filter for wavelength-division multiplexing

Kewitsch, Anthony; Rakuljic, George; Willems, P. A.; Yariv, Amnon

doi:10.1364/ol.23.000106

Cited by 102 publications

(36 citation statements)

References 9 publications

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“…The refractive index variation of the grating in Fig. 7 is expressed in the Cartecian system by the function (15) By using the transformation between the two Cartecian systems, it can be easily shown that the fundamental spatial harmonic of the relative dielectric permittivity perturbation [(4)], in the system, can be expressed as [29]: (16) where , , and . The coefficient can be used in (6) to calculate the coupling coefficients of the tilted grating.…”

Section: B Estimation Of the Coupling Coefficients For A Tilted Gratingmentioning

confidence: 99%

“…Therefore, such OADM geometry will always suffer from strong backreflections at both drop and add input ports. It should be mentioned that this geometry is pertinent to a recently reported fiber-optic implementation of this OADM [15].…”

Section: Tilted Grating Optimizationmentioning

confidence: 99%

“…1), based on a null coupler with a tilted grating in its waist, has been recently reported by Kewitsch et al [15]. Null couplers are comprised of two dissimilar waveguides brought gradually in close proximity and finally in contact to form the waist.…”

Section: Introductionmentioning

confidence: 99%

“…The devices are actually based on adiabatic mode transformation [18], [19] taking place along the coupler arms and their waist. A short period UV-written tilted grating can provide resonant contra-directional coupling and add/drop function [15]. The principle of operation of the device is discussed in more detail in Section II.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Design considerations in optical add/drop multiplexers based on grating-assisted null couplers

Riziotis

Zervas

2001

J. Lightwave Technol.

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Abstract-The performance of a fully optimized optical add/drop multiplexer (OADM), based on null couplers and tilted Bragg gratings, is studied in detail. It is shown that maximization of the device performance involves three main optimization steps. First, the waveguide asymmetry ( 2 1 ratio) should be optimized in order to minimize the extinction ratio of the unwanted mode at the null coupler waist. Second, the coupler taper shape should be optimized in order to further minimize the aforementioned extinction ratio. Third, the grating tilt angle and relative width can be also optimized to give negligible backreflections at the input port and minimize radiation losses. The results show that the proposed high-performance OADM configuration can meet the stringent telecom specifications.

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Section: B Estimation Of the Coupling Coefficients For A Tilted Gratingmentioning

confidence: 99%

Section: Tilted Grating Optimizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design considerations in optical add/drop multiplexers based on grating-assisted null couplers

Riziotis

Zervas

2001

J. Lightwave Technol.

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“…This is due to both, excellent linear and nonlinear optical material properties, and well-established techniques for waveguide formation. In this contribution, we present a mode-selective coupler in LiNbO 3 for application in an add/drop multiplexer for DWDM (dense wavelength division multiplexing) [9,10]. In such a device, either a tilted or an asymmetric Bragg grating reflects a certain wavelength channel out of an input multi-channel data stream to a drop channel [11].…”

Section: Introductionmentioning

confidence: 99%

Mode-selective coupler for wavelength multiplexing using LiNbO3:Ti optical waveguides

2008

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Abstract:A mode-selective directional coupler based on titanium in-diffused channel waveguides in lithium niobate is investigated. This coupler may be utilized as a key part of an add-drop multiplexer for dense wavelength division multiplexing in optical network nodes. The proposed coupler is based on evanescent coupling of the fundamental mode of a single-mode channel to the first higher mode of a parallel bi-modal waveguide.Our experimental results show that a compact directional coupler with coupling efficiencies larger than 90%, large bandwidth around 1550 nm, and with negligible polarization dependence can be realized using electro-optic lithium niobate substrates. PACS

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Adiabatic processes in frequency conversion

Suchowski

Porat

Arie

2013

Laser & Photonics Reviews

143

103

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Adiabatic evolution, an important dynamical process in a variety of classical and quantum systems providing a robust way of steering a system into a desired state , was introduced only recently to frequency conversion . Adiabatic frequency conversion allowed the achievement of efficient scalable broadband frequency conversion and was applied successfully to the conversion of ultrashort pulses, demonstrating near‐100% efficiency for ultrabroadband spectrum . The underlying analogy between undepleted pump nonlinear processes and coherently excited quantum systems was extended in the past few years to multi‐level quantum systems, demonstrating new concepts in frequency conversion, such as complete frequency conversion through an absorption band . Additionally, the undepleted pump restriction was removed, enabling the exploration of adiabatic processes in the fully nonlinear dynamics regime of nonlinear optics . In this article, the basic concept of adiabatic frequency conversion is introduced, and recent advances in ultrashort physics, multi‐process systems, and the fully nonlinear dynamics regime are reviewed.

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All-fiber zero-insertion-loss add–drop filter for wavelength-division multiplexing

Cited by 102 publications

References 9 publications

Design considerations in optical add/drop multiplexers based on grating-assisted null couplers

Design considerations in optical add/drop multiplexers based on grating-assisted null couplers

Mode-selective coupler for wavelength multiplexing using LiNbO3:Ti optical waveguides

Adiabatic processes in frequency conversion

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